staging: gdm724x: drop unused CDC defines

This driver has a copy of some of the CDC defines but which are
currently unused.
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20220725075841.1187-6-johan@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gdm724x/gdm_tty.c

@@ -17,12 +17,6 @@
 #define GDM_TTY_MAJOR 0
 #define GDM_TTY_MINOR 32
 
-#define ACM_CTRL_DTR 0x01
-#define ACM_CTRL_RTS 0x02
-#define ACM_CTRL_DSR 0x02
-#define ACM_CTRL_RI  0x08
-#define ACM_CTRL_DCD 0x01
-
 #define WRITE_SIZE 2048
 
 #define MUX_TX_MAX_SIZE 2048